LMK03002 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – Precision Clock Conditioner with Integrated VCO

August 2007
LMK03002/LMK03002C
Precision Clock Conditioner with Integrated VCO
General Description
The LMK03002/LMK03002C precision clock conditioners
combine the functions of jitter cleaning/reconditioning, multi-
plication, and distribution of a reference clock. The devices
integrate a Voltage Controlled Oscillator (VCO), a high per-
formance Integer-N Phase Locked Loop (PLL), a partially
integrated loop filter, and four LVPECL clock output distribu-
tion blocks.
The VCO output is optionally accessible on the Fout port. In-
ternally, the VCO output goes through a VCO Divider to feed
the various clock distribution blocks.
Each clock distribution block includes a programmable di-
vider, a phase synchronization circuit, a programmable delay,
a clock output mux, and an LVPECL output buffer. This allows
multiple integer-related and phase-adjusted copies of the ref-
erence to be distributed to four system components.
The clock conditioners come in a 48-pin LLP package and are
footprint compatible with other clocking devices in the same
family.
Features
■ ^{Integrated VCO with very low phase noise floor}
■ ^{Integrated Integer-N PLL with outstanding normalized}
phase noise contribution of -224 dBc/Hz
■ ^{Clock generator performance (10 Hz - 20 MHz)}
— LMK03002C: 200 fs RMS jitter
■ ^{Jitter cleaner performance grade (12 kHz to 20 MHz)}
— LMK03002: 800 fs RMS jitter
— LMK03002C: 400 fs RMS jitter
■ ^{VCO frequency: 1566 to 1724 MHz}
■ ^{Clock output frequency range of 1 to 862 MHz}
■ ^{4 LVPECL clock outputs}
■ ^{Partially integrated loop filter}
■ ^{Dedicated divider and delay blocks on each clock output}
■ ^{Pin compatible family of clocking devices}
■ ^{3.15 to 3.45 V operation}
■ ^{Package: 48 pin LLP (7.0 x 7.0 x 0.8 mm)}
Target Applications
■ ^{Data Converter Clocking}
■ ^{Networking, SONET/SDH, DSLAM}
■ ^{Wireless Infrastructure}
■ ^Medical
■ ^{Test and Measurement}
■ ^{Military / Aerospace}
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